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5c5d01d84a
in the distribution. Added --forget-inc-paths to the command line of the assembler in the Makefiles, because the assembler does now have builtin paths and will find include files from an installation first. Hopefully fixed any problems that arose from the two changes. git-svn-id: svn://svn.cc65.org/cc65/trunk@4223 b7a2c559-68d2-44c3-8de9-860c34a00d81
28 lines
554 B
ArmAsm
28 lines
554 B
ArmAsm
;
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; Ullrich von Bassewitz, 07.08.1998
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;
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; unsigned char revers (unsigned char onoff);
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;
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.export _revers
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.include "plus4.inc"
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.proc _revers
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ldx #$00 ; Assume revers off
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tay ; Test onoff
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beq L1 ; Jump if off
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ldx #$80 ; Load on value
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ldy #$00 ; Assume old value is zero
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L1: lda RVS ; Load old value
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stx RVS ; Set new value
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beq L2 ; Jump if old value zero
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iny ; Make old value = 1
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L2: ldx #$00 ; Load high byte of result
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tya ; Load low byte, set CC
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rts
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.endproc
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